Europe’s debt crisis has reached American shores: MF Global, a financial firm headed by former New Jersey governor Jon Corzine, filed for bankruptcy this morning. The company had bet $6.3 billion on European sovereign debt, driving away investors and causing its stock to fall 67% last week. Though MF Global sought a buyer, that effort seems to have been unsuccessful. The small firm’s collapse comes as a surprise, the Los Angeles Times notes, given Corzine’s former post as head of Goldman Sachs. (More Europe stories.)